nasa researchers have identified just 9600 near earth * toda 9600. but that is about a little under 1 percent of the million asteroids that we believe our nearest. for more on this latest as terrell flyby and the russian fireball, and joined by dr. amelie right car research assistant and astrophysics with the american museum of natural history. britain have year. this was an exciting day, a more exciting than any of us, i think , bargained for and certainly the russians. my goodness. >> absolutely. if. lou: is going to start with the astros first because i am so impressed with the precision, the calculation. this asteroid, da 14, it would pass through at 17,000 miles above our surface and they were exactly right. >> a very close call, but we knew exactly where was going. and so -- lou: and with of thousands yes synchronous satellites, would there be principally telecommunications are weather satellites up there, 20,000 miles. i'm sort of surprised that something did not get hit. that is a lot of stuff up there. >> a lot of stuff, was still mostly emp